4256A25G02/1C31025G05_Ningde Androld Automation Equipment Co.,Ltd.

June 10, 2026

4256A25G02/1C31025G05

4256A25G02 (Westinghouse old part number) and 1C31025G05 (Emerson unified aftermarket spare part number) are fully interchangeable second-generation MRC (Main Remote Control) master control card for the Ovation WDPF distributed control system, serving as the core communication gateway for remote I/O racks.

Description

This module realizes high-speed bidirectional data transmission, remote bus resource scheduling and field analog/digital signal preprocessing between central control cabinets and distributed on-site remote I/O stations. Compared with the base version 4256A25G01/1C31025G03, the G02 upgraded model optimizes main control processing chips, bus communication algorithms and redundant fault switching logic, featuring larger data cache, faster redundant channel switching response and enhanced long-term anti-interference performance, suitable for medium and large multi-station DCS control systems.

The circuit board adopts multi-layer high-temperature resistant FR-4 industrial PCB with full surrounding electromagnetic shielding layout. 1000V AC/DC galvanic isolation is designed between external remote bus terminals and internal logic circuits to suppress strong electromagnetic noise generated by high-voltage equipment, inverters and large rotating machinery in thermal power, petrochemical, metallurgical and other heavy industrial sites.

Every finished card undergoes strict factory verification: 72-hour high-low temperature cycle aging, full-load continuous bus communication testing, redundant channel failure simulation and full-channel hardware precision calibration. It supports single-slot hot-swappable plug-in installation on the DCS rack backplane without shutting down the whole control system, and integrates multi-stage surge suppression, overvoltage, overcurrent, reverse polarity and short-circuit protection circuits. Multiple independent LED diagnostic lights display power supply, main bus link, remote channel running status and hardware fault codes for quick on-site troubleshooting, effectively improving system continuous operation reliability and reducing unplanned production downtime and maintenance labor costs.

Model Matching & Compatibility Note

Original Westinghouse model: 4256A25G02
Emerson unified spare part code: 1C31025G05
Downward compatible: Direct replacement for 4256A25G01 / 1C31025G03, no system configuration modification required
Series derivative distinction:
- 1C31025G04: Standard bandwidth version of G02
- 1C31025G05: Enhanced stability version of G02 (widely stocked aftermarket model)
- 1C31025G06: Ultra-high bandwidth version for super-large multi-rack systems

Technical Specifications

PCB Substrate: Multi-layer high heat-resistant FR-4 industrial circuit board
Operating Temperature Range: -25℃ ~ +75℃
Storage Humidity: 5%–90% RH, non-condensing
EMC Compliance: Industrial Class II, CE & LVD certified, conforms to EN 61000 series anti-interference standards
Bus Interface: Dedicated high-speed MRC link bus for Ovation remote racks
Channel Isolation: 1000V AC/DC galvanic isolation between field bus terminals and internal logic circuit
Built-in Protection: Surge suppression, overvoltage, overcurrent, reverse polarity, short-circuit protection
Installation Mode: Single-slot hot-swappable plug-in for standard Ovation DCS rack backplane
Quality Standard: Original Emerson/Westinghouse factory certified; each unit with independent factory inspection test report, 12-month official quality warranty

Application Fields

Medium & large thermal power plant Ovation WDPF DCS distributed control systems
Multi-unit regional petrochemical production remote I/O control cabinets
Metallurgical factory full-process distributed production monitoring stations
Large municipal wastewater multi-station automatic control systems
Pulp & paper whole-plant remote signal acquisition racks
Traditional heavy industry multi-rack redundant DCS central control rooms
Energy chemical continuous production line remote monitoring automation platforms

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